Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"Reaction Processes"”.
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Understanding two-phase reaction processes in electrodes for Li-ion batteries
… path in other materials, the (de)lithiation processes of anatase TiO$_{2}$ and LiVPO$_{4}$ at high cycling rates were also examined with $\textit{in situ}$ synchrotron XRD. Phase separation was found to occur, even at high rates, for transitions TiO$_{2}$ ($\textit{I41/amd}$)$\rightarrow$ …
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Electrochemical Synthesis of Propylene Oxide With Alternating and Direct Current
Electro-organic processes typically contain complex reaction sequences which couple the heterogeneous electrode reactions with an extended homogeneous reaction pathway. An experimental - theoretical approach was applied to understand the coupled diffusion-reaction processes and establish general …
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Simulation and optimisation of industrial steam reformers. Development of models for both primary and secondary steam reformers and implementation of optimisation to improve both the performance of existing equipment and the design of future equipment.
… due to the `building block' nature of its reaction products is unusual and generally is perceived as a `utility' to other reaction processes and hence the focus is drawn " towards the 'main' reaction processes of the system. Additionally as a `mature' process, steam reforming is often …
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Adaptive Finite Element Computation of Chemical Flow Reactors
… of the complex interplay between flow, mixing processes and reaction processes. To describe the chemical and physical processes taking place in reactive flows, many chemical species are to be considered with often a few hundred elementary reactions. Thus the system of equations modelling the …
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Numerical modelling of hydrodynamic and solute transport processes in shallow water environment
… hydrodynamic, solute transport and biochemical reaction processes in shallow water environment, combining both Euler and Lagrangian techniques. The research consists of two parts: the rapid flow modelling and the solute transport modelling. In the rapid flow modelling, the research is focused on …
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Numerical Solution Techniques for Reaction Parameter Sensitivity Coefficients in Multicomponent Subsurface Transport Models
… equations are coupled together through reaction source/sink terms. The corresponding sensitivity equations take the form of a system of linear PDEs and ODEs. Codes are developed to compare the practice of solving the entire system of sensitivity equations to applying the operator …
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Phase Relations in the YBa2Cu3O7-x - SiO2 System and the Impact on Superconducting Fibers
… regard, a rigorous characterization study of the reaction phases within YBCO glass fibers, heat-treated YBCO+SiO2 pellets, rapid thermally annealed YBCO+SiO2 rods and rapid thermally annealed YBCO powder inside a fused silica tube is provided. These analyses are based on a vast set of generated …
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Sensitive Detection of Foodborne E. coli O157:H7 by Dendrimer-aptamer Modified Microchannels - with RCA Signal Intensifications
… understand the RCA process and optimize its reaction conditions, the RCA reaction processes are followed over time using atomic force microscopy and agarose gel electrophoresis. Subsequently, the optimized RCA reaction conditions are used in a dendrimer-aptamer microfluidic whole-cell …
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Defect reactions and impurity control in silicon
… has covered the scientific issues of defect reactions involving dopants and impurities in Si, and the applications of this knowledge to reactive ion etching (RIE) and Fe gettering processes. The reactions among self-interstitials (Sii), vacancies (V), impurities (C, 0), and dopants (B, P) in …
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Modeling Manganese Sorption and Surface Oxidation During Filtration
… by explicitly accounting for the transport and reaction processes within the porous structure of the MnOx(s) coating (referred to as the "mechanistic" model). Both models were applied to experimental data and used to evaluate the oxidation rate constant, which was the only unknown parameter. An …
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Thermochemical properties, bond energies and internal rotor potentials in methyl ethyl sulfide and oxygenated sulfur hydrocarbons intermediates for modeling its combustion and atmospheric chemistry
… they are oxidized by photochemical and radical reactions to intermediate hydrocarbon and to sulfur oxides. The oxides of these sulfur compounds and the intermediates from the oxidation process are known to form aerosols that can counteract the global warming green house effect. Recent studies …
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Numerical studies of reactive polymer flows in porous materials
… are used to simulate the polymer transport and reaction processes in a two-dimensional porous medium. A new operator splitting technique that allows the moment equations for polymerization to be incorporated into a finite-difference transport model is developed. The novelty of this approach is …
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Structural and electronic properties of noble metals on metal oxide surfaces
… complexity of the interfaces and catalytic reaction processes, basic science studies of model systems are needed to guide the construction and optimization of new industrial catalysts. We have employed ultra-high vacuum techniques to investigate the morphology, electronic structure, and …
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Novel reaction discovery with rapid high-throughput experimentation via infrared spectroscopy and enzymatic electrochemical oxidation of alcohols
… is to incorporate environmentally benign reaction design into routine and novel synthesis in order to minimize the use of toxic substances and waste while maximizing the overall efficiency of reaction processes. Both projects reported here encompass the idea of sustainability and …
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Adsorption of Iodine and Water on Silver-Exchanged Mordenite
… by kinetic models. Mass transfer, diffusion and reaction processes involved in the adsorption process were evaluated.</p> <p>In addition, one issue that has to be addressed when using Ag0Z for iodine removal is the potential co-adsorption of other gas species, among which is H2O vapor. Mordenites …
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Turbulent mixing and chemical reaction in baffled stirred tank reactors : a comparison between experiments and a novel micromixing-based computational fluid dynamics model
The optimization of reaction processes to maximize the yield of a desired product while minimizing the formation of undesired by-products is one of the most important steps in process development for drug manufacturing or fine chemical production. In many situations the kinetics of product …
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Mesoscale Computational Analysis on the Reactivity of Heterogeneous Energetic Materials with Electromechanical Properties
… wherein dielectric breakdown and exothermic reaction processes are simultaneously resolved over the nanosecond timescale based on an electrodynamic-chemical-thermal framework. Here, the breakdown process is explicitly modeled as the irreversible transition of the material from its initially …
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Field Emission Based Sensors Using Carbon Nanotubes
… regimes caused by three different gas-surface reaction processes. Operation of CNT emitters in a hydrogen atmosphere was found to improve emission stability. Tube deformation, elastic or plastic, was found to occur for high electric fields. Emission performance was also characterized by surface …
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Reactive solids under shock compression
… and other observations of the launch and impact processes, we have proposed a new launch mechanism for these flyers that differs from previous ideas in the literature. Through coupling the laser-driven flyer-plate apparatus with ultrafast spectroscopic detectors such as a streak camera and …
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